Use of a new complex additive in the construction of the hydraulic tunnel of the don main canal

Conclusions

• 1. The introduction of the additive to the concrete mixes slows setting in the initial period and accelerates hardening 22–24 h after preparing the concrete mix.

• 2. The impermeability of the concrete increases by a factor of 3–4 and the frost resistance by a factor of 2. The 28-day strength of the concrete is 15–20% higher. The additive does not worsen the sulfate resistance of concrete, promotes preservation of steel reinforcement, and does not form “salted-out spots” on the surface.